Key-wheel type-writing machine.



No. 747,105. PATENTED DEG.15, 1903. W. WENDT. KEY WHEEL TYPE WRITING MACHINE.

APPLIUATION FILED MAR, 8, 1900. H0 MODEL. 3 SHEETS-SHEET 1.

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/ Ill ii! 00 0 ii 0 0 I71 29 2 ,2 W Z726 2m PATENTED DEC. 15, 1903.

WBNDT. KEY WHEEL TYPBWRITING MACHINE.

APPLIDATION FILED M R. 8. 1900. N0 MODEL. A 3 SHEETS-SHEET 2.

noTo-uww. WASHmr-TON. By C PATENTED DEC. 15, 1903.

W. WENDT.

KEY WHEEL TYPE WRITING MACHINE.

APPLICATION FILED MA 8. 1900. R0 MODEL. R 3 SHEETS-SHEET 3.

lUmiTnn fiTaTrzs Tatented December 15, 1903.

PATENT @rrrnn.

KEY-WHEEL TYPE WRlTlNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 747,105, dated December 1 3- Applioation filed March 3,1900. $erial No- '7,925. (No model.)

To all whom it may concern:

Beitknown that LWILHELM WENDT,asubject of the King of Prussia, German Emperor, and a resident of the city of Berlin, Kingdom of Prussia,and Empire of Germany, have invented certain new and useful Improvements in Key-Wheel 'lype-l/Vriting Machines,

of'which the following is a specification.

The present invention relates to a keywheel type-writer, the construction of which not only permits of a firm arresting of the type-wheel, but also regulates the blow of the hammer and at the same time causes the type to be struck by the whole surface of the hammer. This is attained by the arrangement of a segment connected with the wheel, which is arrested partly by the pressure of the key-lever on an angle-lever engaging into the slit of a disk firmly connected to the segment and partly by stopping-pins raised at the same time with the movement of the segment, and also by the arrangementof a hammer, together with this stopping device, which can be adjusted horizontally on a support and of which the blow against the fixed typewheel can be regulated at will by a spring which influences the hammer, and a nut kept in the support.

Theaccompanying drawings illustrateamachine by which the object of theinvention can be executed.

Figure 1 shows a top view of the machine; Fig. 2, a side view of the same. Fig. 3 is a representation of the moving mechanism of the machine. Fig. 4 shows the segment which fixes the type-wheel in the one direction, and Fig. 5 shows the disk connected with the segment which effects the fixing of the typewheel in the other direction. Fig. 6 shows the hammer-stopping device and at the same time a top view of the pin-carrying arm which effects the movement of the carriage. Fig. '7 is arear elevation of the parts shownin Fig. 6.

The mechanism of the machine, which to a certain extent is divided into two halves, is composed of the following parts: Above the key-levers d, supported on the upper edge of a plate a and between the two combs b c, a number of single-arm levers e are fixed at the right and at the left side at certain distances from each other and pivoted at their outer ends, while the inner ends of the same are guided between combsf and almost meet each other in the center of the machine. Between two plates g h, arranged above each other vertically, stopping-pins 2' are arranged according to the number of levers e, movable, so that one of them always stands on the inner ends of two single-arm levers e, situated opposite and in line with each other. These stopping-pins stand in a row behind each other between the two wings of the stopping-segmentj, and in their position of rest they project only very little over the plate g. At the front of this row of pins is a stop it, fixed firmly on the plate g, which limits the right or left turning of the segment Behind this row of stopping-pins the upright shaft 'm,which carries the type-wheel Z, is supported in a socket n, which also turns. This socket carries the segment j, and below the segment there is a peculiarly-shaped square driving wheel or disk 0, fixed in the socket. Close behind the two rows ofsinglearm levers, to the left as well as to the right, a turnable frame 99 is arranged, of which the longitudinal side, turned toward the key, rests on the key-levers. The upper ends of the drivingarms g, which are fixed to these two frames and are situated to the right as well as to the left in corresponding notches w w of the square driving-wheel 0, efiecteither a right or left turning of the type-wheel Z. in order that the key-levers may after touching always jump quickly back into their positions of rest, spring-pressed pins'rare arranged immediately before their rear ends, which press down upon them. A frame or bails, pivoted at its rear end at s, bears across the rear ends of the key-levers and back of its pivotal points carries a horizontal rod .9 having a central vertical arm 25, which is thus oscillated backward when any key is depressed and at its upper end engages an arm uofa three pronged or branched lever a pivoted to a bar 16', depending from the plate o of the frame of the machine. Another arm a of lever a carries a pin 9, and the third arm 21, carries a pin 8, the pin 8 being adapted to engage the teeth of an escapement-wheel 0c, fixedon the shaft 2 and spring-actuated in the direction of the arrow, while the pin 9 engages in a slot in the forward end of the pawl-lever 3, arranged below the three-pronged lever and engaging at ICO its rear end the lever 1. A spring 2, connecting the branch to with the frame of the machine, serves to normally return the arm 11, to its position of rest, which is illustrated in Fig. 6 and in dotted lines in Fig. 3. The lever 1 is arranged to oscillate on the foundationplate of the machine. On plate 1) a support 4 is mounted, in which the hammer 5 slides, the hammer being pivotally connected with the lever 1. In the support 4 a nut 6 is threaded and presses against one end of the spring 7, which is pressed with its other end against a shoulder or stop 5.

The operation of the machine is as follows: If a key-lever d of the right or left group is pressed down, its rear part rises, whereby at the same time the respective right or left single-arm lever e, together with the stopping-pin t', resting on it, is raised; but at the same time through the medium of the frame 19, which rests on the key-lever arm, the right or left driving-arm q, and with it the drivingwheel on the socket a, are turned so much to the right or left until the segmentj pushes against the raised pin 2'. By means of the right perpendicularly-raised arm at the segment j the type-wheel is at the same time turned so far that the type marked by the stopping-pinstandbeforethehammer. When a key-lever is raised in the rear by the depression of a key, the bail s is raised at its forward endand the arm 15 carried backward, engaging the three-pronged lever a and turning it on its axis, thus causing pin 8 to engage the teeth of ratchet-wheel wand hold it against its normal spring actuation, while the pawl-lever 3 is disengaged from the teeth of the wheel 00, thus releasing said lever 3, the lever 1, and the hammer, permitting the hammer-spring to actuate the hammer to make a stroke. When the key is released, the bails drops and the spring 2 acting on branch 11, of arm U2 draws the arm forward, releasing the pin 8 from and engaging the tooth of lever 3 with the teeth of wheel (1:. The lever 1 is brought by the stroke of the hammer into the position shown in dotted lines in Fig. 3, the pawl-lever 3 being moved forward on pin 9 of arm 10 until the pin stops this movement. Now the lever t, actuated byarm '11, under the action of spring 2, begins to move toward its normal position--that is, when the depressed key is releasedand the tooth of the pawl-lever engages in the next tooth-space of wheel x. As soon as the pin 8 leaves the wheel 00 (said wheel being springactuated, as before described) by its engagement with the pawl-lever 3 the wheel brings the latter into its normal position, as shown in full lines in Fig. 6, the pawl-lever 3 meanwhile sliding on pin 9 of arm a when the mechanism is ready for another hammerstroke to be made by depressing another key. As soon as the hammer has made a blow the paper-carriage, driven by a spring, jumps one toot-h forward, and the steps described for producing the next letter begin anew in the same succession.

The hammer 5, which is thrown forward by the spring 7, provided on it, can be regulated to strike with such power as may be required by adjusting this spring by means of the nut 6.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In akey-wheel type-writing machine,the combination with a vertical shaft, a toothed segment and a driving-wheel rigidly fixed on said shaft, of driving-arms engaging said driving-wheel and actuated by the key-levers to oscillate the vertical shaft and its attachments, a vertical stop-pin for each key-lever, and a spring for normally pressing each stop pin down said stop-pin being raised at each stroke of its key-lever into the plane of movement of the segment to limit the oscillation of the segment, substantially as described.

2. In a key-wheel type-writing machine, the combination with the key-levers, a vertical shaft, and the key-wheel and a toothed segment fixed on said shaft, of connections whereby said shaft and its attachments are oscillated by the movement of the key-levers, a double series of transverse levers pivoted at their outer'ends, resting on the key-levers and terminating at the center of the machine, one series resting on the key-levers to the right of the center and the other series on the key1evers to the left, and a series of vertical stop-pins, one resting and normally springpressed upon each lover of the two series, substantially as described.

3. In a key-lever type-writing machine, the combination with the hammer, a spring for actuating it to make its stroke, a return-lever pivoted at its lower end to the frame of the machine and at its upper end to the rearend of the hammer, a pawl-lever connected to the retu rn-lever and slotted near one end, a threearmed lever pivoted to the frame of the machine, a pin thereon engaging in the slot of the pawl-lever, a pin on another arm of the three-armed lever, a ratchet-wheel arranged to engage the last-named pin and the tooth of the pawl-lever as required, and means operated by the depression of the keys to operate the three-armed lever in the manner described and for the purposes set forth.

In witness whereof I have hereunto signed my name, this 17th day of February, 1900, in the presence of two subscribing witnesses.

WILHELM WENDT.

Witnesses HENRY HASPER, WOLDEMAR HAUPT. 

